Across
1
Center of an atom or cell
5
Gas form of a liquid
6
Nerve cell in the brain
9
Substance with pH below 7
11
Magnetic metallic element
12
Substance with pH above 7
Down
2
Naturally occurring inorganic solid
3
Curved glass that refracts light
4
Tectonic landmass section
7
The Red Planet
8
Reddish electrical conductor
10
Absolute temperature scale unit
13
Element found in all living things